all: Remove unused method receivers (#8462)

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

lib/ur/contract/contract.go

@@ -266,7 +266,7 @@ func (r *Report) FieldPointers() []interface{} {
 	}
 }
 
-func (r *Report) FieldNames() []string {
+func (*Report) FieldNames() []string {
 	// The database fields that back this struct in PostgreSQL
 	return []string{
 		// V1

lib/ur/failurereporting.go

@@ -195,7 +195,7 @@ func (h *failureHandler) CommitConfiguration(from, to config.Configuration) bool
 	return true
 }
 
-func (h *failureHandler) String() string {
+func (*failureHandler) String() string {
 	return "FailureHandler"
 }
 

lib/ur/usage_report.go

@@ -328,7 +328,7 @@ func (s *Service) reportData(ctx context.Context, urVersion int, preview bool) (
 	return report, nil
 }
 
-func (s *Service) UptimeS() int {
+func (*Service) UptimeS() int {
 	return int(time.Since(StartTime).Seconds())
 }